2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
13 * DOC: Wireless regulatory infrastructure
15 * The usual implementation is for a driver to read a device EEPROM to
16 * determine which regulatory domain it should be operating under, then
17 * looking up the allowable channels in a driver-local table and finally
18 * registering those channels in the wiphy structure.
20 * Another set of compliance enforcement is for drivers to use their
21 * own compliance limits which can be stored on the EEPROM. The host
22 * driver or firmware may ensure these are used.
24 * In addition to all this we provide an extra layer of regulatory
25 * conformance. For drivers which do not have any regulatory
26 * information CRDA provides the complete regulatory solution.
27 * For others it provides a community effort on further restrictions
28 * to enhance compliance.
30 * Note: When number of rules --> infinity we will not be able to
31 * index on alpha2 any more, instead we'll probably have to
32 * rely on some SHA1 checksum of the regdomain for example.
35 #include <linux/kernel.h>
36 #include <linux/list.h>
37 #include <linux/random.h>
38 #include <linux/nl80211.h>
39 #include <linux/platform_device.h>
40 #include <net/wireless.h>
41 #include <net/cfg80211.h>
46 /* Receipt of information from last regulatory request */
47 static struct regulatory_request
*last_request
;
49 /* To trigger userspace events */
50 static struct platform_device
*reg_pdev
;
52 /* Keep the ordering from large to small */
53 static u32 supported_bandwidths
[] = {
59 * Central wireless core regulatory domains, we only need two,
60 * the current one and a world regulatory domain in case we have no
61 * information to give us an alpha2
63 const struct ieee80211_regdomain
*cfg80211_regdomain
;
66 * We use this as a place for the rd structure built from the
67 * last parsed country IE to rest until CRDA gets back to us with
68 * what it thinks should apply for the same country
70 static const struct ieee80211_regdomain
*country_ie_regdomain
;
72 /* Used to queue up regulatory hints */
73 static LIST_HEAD(reg_requests_list
);
74 static spinlock_t reg_requests_lock
;
76 /* Used to queue up beacon hints for review */
77 static LIST_HEAD(reg_pending_beacons
);
78 static spinlock_t reg_pending_beacons_lock
;
80 /* Used to keep track of processed beacon hints */
81 static LIST_HEAD(reg_beacon_list
);
84 struct list_head list
;
85 struct ieee80211_channel chan
;
88 /* We keep a static world regulatory domain in case of the absence of CRDA */
89 static const struct ieee80211_regdomain world_regdom
= {
93 /* IEEE 802.11b/g, channels 1..11 */
94 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
95 /* IEEE 802.11b/g, channels 12..13. No HT40
96 * channel fits here. */
97 REG_RULE(2467-10, 2472+10, 20, 6, 20,
98 NL80211_RRF_PASSIVE_SCAN
|
100 /* IEEE 802.11 channel 14 - Only JP enables
101 * this and for 802.11b only */
102 REG_RULE(2484-10, 2484+10, 20, 6, 20,
103 NL80211_RRF_PASSIVE_SCAN
|
104 NL80211_RRF_NO_IBSS
|
105 NL80211_RRF_NO_OFDM
),
106 /* IEEE 802.11a, channel 36..48 */
107 REG_RULE(5180-10, 5240+10, 40, 6, 20,
108 NL80211_RRF_PASSIVE_SCAN
|
109 NL80211_RRF_NO_IBSS
),
111 /* NB: 5260 MHz - 5700 MHz requies DFS */
113 /* IEEE 802.11a, channel 149..165 */
114 REG_RULE(5745-10, 5825+10, 40, 6, 20,
115 NL80211_RRF_PASSIVE_SCAN
|
116 NL80211_RRF_NO_IBSS
),
120 static const struct ieee80211_regdomain
*cfg80211_world_regdom
=
123 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
124 static char *ieee80211_regdom
= "US";
126 static char *ieee80211_regdom
= "00";
129 module_param(ieee80211_regdom
, charp
, 0444);
130 MODULE_PARM_DESC(ieee80211_regdom
, "IEEE 802.11 regulatory domain code");
132 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
134 * We assume 40 MHz bandwidth for the old regulatory work.
135 * We make emphasis we are using the exact same frequencies
139 static const struct ieee80211_regdomain us_regdom
= {
143 /* IEEE 802.11b/g, channels 1..11 */
144 REG_RULE(2412-10, 2462+10, 40, 6, 27, 0),
145 /* IEEE 802.11a, channel 36 */
146 REG_RULE(5180-10, 5180+10, 40, 6, 23, 0),
147 /* IEEE 802.11a, channel 40 */
148 REG_RULE(5200-10, 5200+10, 40, 6, 23, 0),
149 /* IEEE 802.11a, channel 44 */
150 REG_RULE(5220-10, 5220+10, 40, 6, 23, 0),
151 /* IEEE 802.11a, channels 48..64 */
152 REG_RULE(5240-10, 5320+10, 40, 6, 23, 0),
153 /* IEEE 802.11a, channels 149..165, outdoor */
154 REG_RULE(5745-10, 5825+10, 40, 6, 30, 0),
158 static const struct ieee80211_regdomain jp_regdom
= {
162 /* IEEE 802.11b/g, channels 1..14 */
163 REG_RULE(2412-10, 2484+10, 40, 6, 20, 0),
164 /* IEEE 802.11a, channels 34..48 */
165 REG_RULE(5170-10, 5240+10, 40, 6, 20,
166 NL80211_RRF_PASSIVE_SCAN
),
167 /* IEEE 802.11a, channels 52..64 */
168 REG_RULE(5260-10, 5320+10, 40, 6, 20,
169 NL80211_RRF_NO_IBSS
|
174 static const struct ieee80211_regdomain eu_regdom
= {
177 * This alpha2 is bogus, we leave it here just for stupid
178 * backward compatibility
182 /* IEEE 802.11b/g, channels 1..13 */
183 REG_RULE(2412-10, 2472+10, 40, 6, 20, 0),
184 /* IEEE 802.11a, channel 36 */
185 REG_RULE(5180-10, 5180+10, 40, 6, 23,
186 NL80211_RRF_PASSIVE_SCAN
),
187 /* IEEE 802.11a, channel 40 */
188 REG_RULE(5200-10, 5200+10, 40, 6, 23,
189 NL80211_RRF_PASSIVE_SCAN
),
190 /* IEEE 802.11a, channel 44 */
191 REG_RULE(5220-10, 5220+10, 40, 6, 23,
192 NL80211_RRF_PASSIVE_SCAN
),
193 /* IEEE 802.11a, channels 48..64 */
194 REG_RULE(5240-10, 5320+10, 40, 6, 20,
195 NL80211_RRF_NO_IBSS
|
197 /* IEEE 802.11a, channels 100..140 */
198 REG_RULE(5500-10, 5700+10, 40, 6, 30,
199 NL80211_RRF_NO_IBSS
|
204 static const struct ieee80211_regdomain
*static_regdom(char *alpha2
)
206 if (alpha2
[0] == 'U' && alpha2
[1] == 'S')
208 if (alpha2
[0] == 'J' && alpha2
[1] == 'P')
210 if (alpha2
[0] == 'E' && alpha2
[1] == 'U')
212 /* Default, as per the old rules */
216 static bool is_old_static_regdom(const struct ieee80211_regdomain
*rd
)
218 if (rd
== &us_regdom
|| rd
== &jp_regdom
|| rd
== &eu_regdom
)
223 static inline bool is_old_static_regdom(const struct ieee80211_regdomain
*rd
)
229 static void reset_regdomains(void)
231 /* avoid freeing static information or freeing something twice */
232 if (cfg80211_regdomain
== cfg80211_world_regdom
)
233 cfg80211_regdomain
= NULL
;
234 if (cfg80211_world_regdom
== &world_regdom
)
235 cfg80211_world_regdom
= NULL
;
236 if (cfg80211_regdomain
== &world_regdom
)
237 cfg80211_regdomain
= NULL
;
238 if (is_old_static_regdom(cfg80211_regdomain
))
239 cfg80211_regdomain
= NULL
;
241 kfree(cfg80211_regdomain
);
242 kfree(cfg80211_world_regdom
);
244 cfg80211_world_regdom
= &world_regdom
;
245 cfg80211_regdomain
= NULL
;
249 * Dynamic world regulatory domain requested by the wireless
250 * core upon initialization
252 static void update_world_regdomain(const struct ieee80211_regdomain
*rd
)
254 BUG_ON(!last_request
);
258 cfg80211_world_regdom
= rd
;
259 cfg80211_regdomain
= rd
;
262 bool is_world_regdom(const char *alpha2
)
266 if (alpha2
[0] == '0' && alpha2
[1] == '0')
271 static bool is_alpha2_set(const char *alpha2
)
275 if (alpha2
[0] != 0 && alpha2
[1] != 0)
280 static bool is_alpha_upper(char letter
)
283 if (letter
>= 65 && letter
<= 90)
288 static bool is_unknown_alpha2(const char *alpha2
)
293 * Special case where regulatory domain was built by driver
294 * but a specific alpha2 cannot be determined
296 if (alpha2
[0] == '9' && alpha2
[1] == '9')
301 static bool is_intersected_alpha2(const char *alpha2
)
306 * Special case where regulatory domain is the
307 * result of an intersection between two regulatory domain
310 if (alpha2
[0] == '9' && alpha2
[1] == '8')
315 static bool is_an_alpha2(const char *alpha2
)
319 if (is_alpha_upper(alpha2
[0]) && is_alpha_upper(alpha2
[1]))
324 static bool alpha2_equal(const char *alpha2_x
, const char *alpha2_y
)
326 if (!alpha2_x
|| !alpha2_y
)
328 if (alpha2_x
[0] == alpha2_y
[0] &&
329 alpha2_x
[1] == alpha2_y
[1])
334 static bool regdom_changes(const char *alpha2
)
336 assert_cfg80211_lock();
338 if (!cfg80211_regdomain
)
340 if (alpha2_equal(cfg80211_regdomain
->alpha2
, alpha2
))
346 * country_ie_integrity_changes - tells us if the country IE has changed
347 * @checksum: checksum of country IE of fields we are interested in
349 * If the country IE has not changed you can ignore it safely. This is
350 * useful to determine if two devices are seeing two different country IEs
351 * even on the same alpha2. Note that this will return false if no IE has
352 * been set on the wireless core yet.
354 static bool country_ie_integrity_changes(u32 checksum
)
356 /* If no IE has been set then the checksum doesn't change */
357 if (unlikely(!last_request
->country_ie_checksum
))
359 if (unlikely(last_request
->country_ie_checksum
!= checksum
))
365 * This lets us keep regulatory code which is updated on a regulatory
366 * basis in userspace.
368 static int call_crda(const char *alpha2
)
370 char country_env
[9 + 2] = "COUNTRY=";
376 if (!is_world_regdom((char *) alpha2
))
377 printk(KERN_INFO
"cfg80211: Calling CRDA for country: %c%c\n",
378 alpha2
[0], alpha2
[1]);
380 printk(KERN_INFO
"cfg80211: Calling CRDA to update world "
381 "regulatory domain\n");
383 country_env
[8] = alpha2
[0];
384 country_env
[9] = alpha2
[1];
386 return kobject_uevent_env(®_pdev
->dev
.kobj
, KOBJ_CHANGE
, envp
);
389 /* Used by nl80211 before kmalloc'ing our regulatory domain */
390 bool reg_is_valid_request(const char *alpha2
)
395 return alpha2_equal(last_request
->alpha2
, alpha2
);
398 /* Sanity check on a regulatory rule */
399 static bool is_valid_reg_rule(const struct ieee80211_reg_rule
*rule
)
401 const struct ieee80211_freq_range
*freq_range
= &rule
->freq_range
;
404 if (freq_range
->start_freq_khz
<= 0 || freq_range
->end_freq_khz
<= 0)
407 if (freq_range
->start_freq_khz
> freq_range
->end_freq_khz
)
410 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
412 if (freq_range
->end_freq_khz
<= freq_range
->start_freq_khz
||
413 freq_range
->max_bandwidth_khz
> freq_diff
)
419 static bool is_valid_rd(const struct ieee80211_regdomain
*rd
)
421 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
424 if (!rd
->n_reg_rules
)
427 if (WARN_ON(rd
->n_reg_rules
> NL80211_MAX_SUPP_REG_RULES
))
430 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
431 reg_rule
= &rd
->reg_rules
[i
];
432 if (!is_valid_reg_rule(reg_rule
))
439 /* Returns value in KHz */
440 static u32
freq_max_bandwidth(const struct ieee80211_freq_range
*freq_range
,
444 for (i
= 0; i
< ARRAY_SIZE(supported_bandwidths
); i
++) {
445 u32 start_freq_khz
= freq
- supported_bandwidths
[i
]/2;
446 u32 end_freq_khz
= freq
+ supported_bandwidths
[i
]/2;
447 if (start_freq_khz
>= freq_range
->start_freq_khz
&&
448 end_freq_khz
<= freq_range
->end_freq_khz
)
449 return supported_bandwidths
[i
];
455 * freq_in_rule_band - tells us if a frequency is in a frequency band
456 * @freq_range: frequency rule we want to query
457 * @freq_khz: frequency we are inquiring about
459 * This lets us know if a specific frequency rule is or is not relevant to
460 * a specific frequency's band. Bands are device specific and artificial
461 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
462 * safe for now to assume that a frequency rule should not be part of a
463 * frequency's band if the start freq or end freq are off by more than 2 GHz.
464 * This resolution can be lowered and should be considered as we add
465 * regulatory rule support for other "bands".
467 static bool freq_in_rule_band(const struct ieee80211_freq_range
*freq_range
,
470 #define ONE_GHZ_IN_KHZ 1000000
471 if (abs(freq_khz
- freq_range
->start_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
473 if (abs(freq_khz
- freq_range
->end_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
476 #undef ONE_GHZ_IN_KHZ
480 * Converts a country IE to a regulatory domain. A regulatory domain
481 * structure has a lot of information which the IE doesn't yet have,
482 * so for the other values we use upper max values as we will intersect
483 * with our userspace regulatory agent to get lower bounds.
485 static struct ieee80211_regdomain
*country_ie_2_rd(
490 struct ieee80211_regdomain
*rd
= NULL
;
494 u32 num_rules
= 0, size_of_regd
= 0;
495 u8
*triplets_start
= NULL
;
496 u8 len_at_triplet
= 0;
497 /* the last channel we have registered in a subband (triplet) */
498 int last_sub_max_channel
= 0;
500 *checksum
= 0xDEADBEEF;
502 /* Country IE requirements */
503 BUG_ON(country_ie_len
< IEEE80211_COUNTRY_IE_MIN_LEN
||
504 country_ie_len
& 0x01);
506 alpha2
[0] = country_ie
[0];
507 alpha2
[1] = country_ie
[1];
510 * Third octet can be:
514 * anything else we assume is no restrictions
516 if (country_ie
[2] == 'I')
517 flags
= NL80211_RRF_NO_OUTDOOR
;
518 else if (country_ie
[2] == 'O')
519 flags
= NL80211_RRF_NO_INDOOR
;
524 triplets_start
= country_ie
;
525 len_at_triplet
= country_ie_len
;
527 *checksum
^= ((flags
^ alpha2
[0] ^ alpha2
[1]) << 8);
530 * We need to build a reg rule for each triplet, but first we must
531 * calculate the number of reg rules we will need. We will need one
532 * for each channel subband
534 while (country_ie_len
>= 3) {
536 struct ieee80211_country_ie_triplet
*triplet
=
537 (struct ieee80211_country_ie_triplet
*) country_ie
;
538 int cur_sub_max_channel
= 0, cur_channel
= 0;
540 if (triplet
->ext
.reg_extension_id
>=
541 IEEE80211_COUNTRY_EXTENSION_ID
) {
548 if (triplet
->chans
.first_channel
<= 14)
549 end_channel
= triplet
->chans
.first_channel
+
550 triplet
->chans
.num_channels
;
553 * 5 GHz -- For example in country IEs if the first
554 * channel given is 36 and the number of channels is 4
555 * then the individual channel numbers defined for the
556 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
557 * and not 36, 37, 38, 39.
559 * See: http://tinyurl.com/11d-clarification
561 end_channel
= triplet
->chans
.first_channel
+
562 (4 * (triplet
->chans
.num_channels
- 1));
564 cur_channel
= triplet
->chans
.first_channel
;
565 cur_sub_max_channel
= end_channel
;
567 /* Basic sanity check */
568 if (cur_sub_max_channel
< cur_channel
)
572 * Do not allow overlapping channels. Also channels
573 * passed in each subband must be monotonically
576 if (last_sub_max_channel
) {
577 if (cur_channel
<= last_sub_max_channel
)
579 if (cur_sub_max_channel
<= last_sub_max_channel
)
584 * When dot11RegulatoryClassesRequired is supported
585 * we can throw ext triplets as part of this soup,
586 * for now we don't care when those change as we
589 *checksum
^= ((cur_channel
^ cur_sub_max_channel
) << 8) |
590 ((cur_sub_max_channel
^ cur_sub_max_channel
) << 16) |
591 ((triplet
->chans
.max_power
^ cur_sub_max_channel
) << 24);
593 last_sub_max_channel
= cur_sub_max_channel
;
600 * Note: this is not a IEEE requirement but
601 * simply a memory requirement
603 if (num_rules
> NL80211_MAX_SUPP_REG_RULES
)
607 country_ie
= triplets_start
;
608 country_ie_len
= len_at_triplet
;
610 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
611 (num_rules
* sizeof(struct ieee80211_reg_rule
));
613 rd
= kzalloc(size_of_regd
, GFP_KERNEL
);
617 rd
->n_reg_rules
= num_rules
;
618 rd
->alpha2
[0] = alpha2
[0];
619 rd
->alpha2
[1] = alpha2
[1];
621 /* This time around we fill in the rd */
622 while (country_ie_len
>= 3) {
624 struct ieee80211_country_ie_triplet
*triplet
=
625 (struct ieee80211_country_ie_triplet
*) country_ie
;
626 struct ieee80211_reg_rule
*reg_rule
= NULL
;
627 struct ieee80211_freq_range
*freq_range
= NULL
;
628 struct ieee80211_power_rule
*power_rule
= NULL
;
631 * Must parse if dot11RegulatoryClassesRequired is true,
632 * we don't support this yet
634 if (triplet
->ext
.reg_extension_id
>=
635 IEEE80211_COUNTRY_EXTENSION_ID
) {
641 reg_rule
= &rd
->reg_rules
[i
];
642 freq_range
= ®_rule
->freq_range
;
643 power_rule
= ®_rule
->power_rule
;
645 reg_rule
->flags
= flags
;
648 if (triplet
->chans
.first_channel
<= 14)
649 end_channel
= triplet
->chans
.first_channel
+
650 triplet
->chans
.num_channels
;
652 end_channel
= triplet
->chans
.first_channel
+
653 (4 * (triplet
->chans
.num_channels
- 1));
656 * The +10 is since the regulatory domain expects
657 * the actual band edge, not the center of freq for
658 * its start and end freqs, assuming 20 MHz bandwidth on
659 * the channels passed
661 freq_range
->start_freq_khz
=
662 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
663 triplet
->chans
.first_channel
) - 10);
664 freq_range
->end_freq_khz
=
665 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
669 * These are large arbitrary values we use to intersect later.
670 * Increment this if we ever support >= 40 MHz channels
673 freq_range
->max_bandwidth_khz
= MHZ_TO_KHZ(40);
674 power_rule
->max_antenna_gain
= DBI_TO_MBI(100);
675 power_rule
->max_eirp
= DBM_TO_MBM(100);
681 BUG_ON(i
> NL80211_MAX_SUPP_REG_RULES
);
689 * Helper for regdom_intersect(), this does the real
690 * mathematical intersection fun
692 static int reg_rules_intersect(
693 const struct ieee80211_reg_rule
*rule1
,
694 const struct ieee80211_reg_rule
*rule2
,
695 struct ieee80211_reg_rule
*intersected_rule
)
697 const struct ieee80211_freq_range
*freq_range1
, *freq_range2
;
698 struct ieee80211_freq_range
*freq_range
;
699 const struct ieee80211_power_rule
*power_rule1
, *power_rule2
;
700 struct ieee80211_power_rule
*power_rule
;
703 freq_range1
= &rule1
->freq_range
;
704 freq_range2
= &rule2
->freq_range
;
705 freq_range
= &intersected_rule
->freq_range
;
707 power_rule1
= &rule1
->power_rule
;
708 power_rule2
= &rule2
->power_rule
;
709 power_rule
= &intersected_rule
->power_rule
;
711 freq_range
->start_freq_khz
= max(freq_range1
->start_freq_khz
,
712 freq_range2
->start_freq_khz
);
713 freq_range
->end_freq_khz
= min(freq_range1
->end_freq_khz
,
714 freq_range2
->end_freq_khz
);
715 freq_range
->max_bandwidth_khz
= min(freq_range1
->max_bandwidth_khz
,
716 freq_range2
->max_bandwidth_khz
);
718 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
719 if (freq_range
->max_bandwidth_khz
> freq_diff
)
720 freq_range
->max_bandwidth_khz
= freq_diff
;
722 power_rule
->max_eirp
= min(power_rule1
->max_eirp
,
723 power_rule2
->max_eirp
);
724 power_rule
->max_antenna_gain
= min(power_rule1
->max_antenna_gain
,
725 power_rule2
->max_antenna_gain
);
727 intersected_rule
->flags
= (rule1
->flags
| rule2
->flags
);
729 if (!is_valid_reg_rule(intersected_rule
))
736 * regdom_intersect - do the intersection between two regulatory domains
737 * @rd1: first regulatory domain
738 * @rd2: second regulatory domain
740 * Use this function to get the intersection between two regulatory domains.
741 * Once completed we will mark the alpha2 for the rd as intersected, "98",
742 * as no one single alpha2 can represent this regulatory domain.
744 * Returns a pointer to the regulatory domain structure which will hold the
745 * resulting intersection of rules between rd1 and rd2. We will
746 * kzalloc() this structure for you.
748 static struct ieee80211_regdomain
*regdom_intersect(
749 const struct ieee80211_regdomain
*rd1
,
750 const struct ieee80211_regdomain
*rd2
)
754 unsigned int num_rules
= 0, rule_idx
= 0;
755 const struct ieee80211_reg_rule
*rule1
, *rule2
;
756 struct ieee80211_reg_rule
*intersected_rule
;
757 struct ieee80211_regdomain
*rd
;
758 /* This is just a dummy holder to help us count */
759 struct ieee80211_reg_rule irule
;
761 /* Uses the stack temporarily for counter arithmetic */
762 intersected_rule
= &irule
;
764 memset(intersected_rule
, 0, sizeof(struct ieee80211_reg_rule
));
770 * First we get a count of the rules we'll need, then we actually
771 * build them. This is to so we can malloc() and free() a
772 * regdomain once. The reason we use reg_rules_intersect() here
773 * is it will return -EINVAL if the rule computed makes no sense.
774 * All rules that do check out OK are valid.
777 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
778 rule1
= &rd1
->reg_rules
[x
];
779 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
780 rule2
= &rd2
->reg_rules
[y
];
781 if (!reg_rules_intersect(rule1
, rule2
,
784 memset(intersected_rule
, 0,
785 sizeof(struct ieee80211_reg_rule
));
792 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
793 ((num_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
795 rd
= kzalloc(size_of_regd
, GFP_KERNEL
);
799 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
800 rule1
= &rd1
->reg_rules
[x
];
801 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
802 rule2
= &rd2
->reg_rules
[y
];
804 * This time around instead of using the stack lets
805 * write to the target rule directly saving ourselves
808 intersected_rule
= &rd
->reg_rules
[rule_idx
];
809 r
= reg_rules_intersect(rule1
, rule2
,
812 * No need to memset here the intersected rule here as
813 * we're not using the stack anymore
821 if (rule_idx
!= num_rules
) {
826 rd
->n_reg_rules
= num_rules
;
834 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
835 * want to just have the channel structure use these
837 static u32
map_regdom_flags(u32 rd_flags
)
839 u32 channel_flags
= 0;
840 if (rd_flags
& NL80211_RRF_PASSIVE_SCAN
)
841 channel_flags
|= IEEE80211_CHAN_PASSIVE_SCAN
;
842 if (rd_flags
& NL80211_RRF_NO_IBSS
)
843 channel_flags
|= IEEE80211_CHAN_NO_IBSS
;
844 if (rd_flags
& NL80211_RRF_DFS
)
845 channel_flags
|= IEEE80211_CHAN_RADAR
;
846 return channel_flags
;
849 static int freq_reg_info_regd(struct wiphy
*wiphy
,
852 const struct ieee80211_reg_rule
**reg_rule
,
853 const struct ieee80211_regdomain
*custom_regd
)
856 bool band_rule_found
= false;
857 const struct ieee80211_regdomain
*regd
;
858 u32 max_bandwidth
= 0;
860 regd
= custom_regd
? custom_regd
: cfg80211_regdomain
;
863 * Follow the driver's regulatory domain, if present, unless a country
864 * IE has been processed or a user wants to help complaince further
866 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
867 last_request
->initiator
!= NL80211_REGDOM_SET_BY_USER
&&
874 for (i
= 0; i
< regd
->n_reg_rules
; i
++) {
875 const struct ieee80211_reg_rule
*rr
;
876 const struct ieee80211_freq_range
*fr
= NULL
;
877 const struct ieee80211_power_rule
*pr
= NULL
;
879 rr
= ®d
->reg_rules
[i
];
880 fr
= &rr
->freq_range
;
881 pr
= &rr
->power_rule
;
884 * We only need to know if one frequency rule was
885 * was in center_freq's band, that's enough, so lets
886 * not overwrite it once found
888 if (!band_rule_found
)
889 band_rule_found
= freq_in_rule_band(fr
, center_freq
);
891 max_bandwidth
= freq_max_bandwidth(fr
, center_freq
);
893 if (max_bandwidth
&& *bandwidth
<= max_bandwidth
) {
895 *bandwidth
= max_bandwidth
;
900 if (!band_rule_found
)
903 return !max_bandwidth
;
905 EXPORT_SYMBOL(freq_reg_info
);
907 int freq_reg_info(struct wiphy
*wiphy
, u32 center_freq
, u32
*bandwidth
,
908 const struct ieee80211_reg_rule
**reg_rule
)
910 return freq_reg_info_regd(wiphy
, center_freq
,
911 bandwidth
, reg_rule
, NULL
);
914 static void handle_channel(struct wiphy
*wiphy
, enum ieee80211_band band
,
915 unsigned int chan_idx
)
919 u32 max_bandwidth
= 0;
920 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
921 const struct ieee80211_power_rule
*power_rule
= NULL
;
922 struct ieee80211_supported_band
*sband
;
923 struct ieee80211_channel
*chan
;
924 struct wiphy
*request_wiphy
= NULL
;
926 assert_cfg80211_lock();
928 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
930 sband
= wiphy
->bands
[band
];
931 BUG_ON(chan_idx
>= sband
->n_channels
);
932 chan
= &sband
->channels
[chan_idx
];
934 flags
= chan
->orig_flags
;
936 r
= freq_reg_info(wiphy
, MHZ_TO_KHZ(chan
->center_freq
),
937 &max_bandwidth
, ®_rule
);
941 * This means no regulatory rule was found in the country IE
942 * with a frequency range on the center_freq's band, since
943 * IEEE-802.11 allows for a country IE to have a subset of the
944 * regulatory information provided in a country we ignore
945 * disabling the channel unless at least one reg rule was
946 * found on the center_freq's band. For details see this
949 * http://tinyurl.com/11d-clarification
952 last_request
->initiator
==
953 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
954 #ifdef CONFIG_CFG80211_REG_DEBUG
955 printk(KERN_DEBUG
"cfg80211: Leaving channel %d MHz "
956 "intact on %s - no rule found in band on "
958 chan
->center_freq
, wiphy_name(wiphy
));
962 * In this case we know the country IE has at least one reg rule
963 * for the band so we respect its band definitions
965 #ifdef CONFIG_CFG80211_REG_DEBUG
966 if (last_request
->initiator
==
967 NL80211_REGDOM_SET_BY_COUNTRY_IE
)
968 printk(KERN_DEBUG
"cfg80211: Disabling "
969 "channel %d MHz on %s due to "
971 chan
->center_freq
, wiphy_name(wiphy
));
973 flags
|= IEEE80211_CHAN_DISABLED
;
979 power_rule
= ®_rule
->power_rule
;
981 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
982 request_wiphy
&& request_wiphy
== wiphy
&&
983 request_wiphy
->strict_regulatory
) {
985 * This gaurantees the driver's requested regulatory domain
986 * will always be used as a base for further regulatory
989 chan
->flags
= chan
->orig_flags
=
990 map_regdom_flags(reg_rule
->flags
);
991 chan
->max_antenna_gain
= chan
->orig_mag
=
992 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
993 chan
->max_bandwidth
= KHZ_TO_MHZ(max_bandwidth
);
994 chan
->max_power
= chan
->orig_mpwr
=
995 (int) MBM_TO_DBM(power_rule
->max_eirp
);
999 chan
->flags
= flags
| map_regdom_flags(reg_rule
->flags
);
1000 chan
->max_antenna_gain
= min(chan
->orig_mag
,
1001 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
));
1002 chan
->max_bandwidth
= KHZ_TO_MHZ(max_bandwidth
);
1003 if (chan
->orig_mpwr
)
1004 chan
->max_power
= min(chan
->orig_mpwr
,
1005 (int) MBM_TO_DBM(power_rule
->max_eirp
));
1007 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
1010 static void handle_band(struct wiphy
*wiphy
, enum ieee80211_band band
)
1013 struct ieee80211_supported_band
*sband
;
1015 BUG_ON(!wiphy
->bands
[band
]);
1016 sband
= wiphy
->bands
[band
];
1018 for (i
= 0; i
< sband
->n_channels
; i
++)
1019 handle_channel(wiphy
, band
, i
);
1022 static bool ignore_reg_update(struct wiphy
*wiphy
,
1023 enum nl80211_reg_initiator initiator
)
1027 if (initiator
== NL80211_REGDOM_SET_BY_CORE
&&
1028 wiphy
->custom_regulatory
)
1031 * wiphy->regd will be set once the device has its own
1032 * desired regulatory domain set
1034 if (wiphy
->strict_regulatory
&& !wiphy
->regd
&&
1035 !is_world_regdom(last_request
->alpha2
))
1040 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator
)
1042 struct cfg80211_registered_device
*drv
;
1044 list_for_each_entry(drv
, &cfg80211_drv_list
, list
)
1045 wiphy_update_regulatory(&drv
->wiphy
, initiator
);
1048 static void handle_reg_beacon(struct wiphy
*wiphy
,
1049 unsigned int chan_idx
,
1050 struct reg_beacon
*reg_beacon
)
1052 #ifdef CONFIG_CFG80211_REG_DEBUG
1053 #define REG_DEBUG_BEACON_FLAG(desc) \
1054 printk(KERN_DEBUG "cfg80211: Enabling " desc " on " \
1055 "frequency: %d MHz (Ch %d) on %s\n", \
1056 reg_beacon->chan.center_freq, \
1057 ieee80211_frequency_to_channel(reg_beacon->chan.center_freq), \
1060 #define REG_DEBUG_BEACON_FLAG(desc) do {} while (0)
1062 struct ieee80211_supported_band
*sband
;
1063 struct ieee80211_channel
*chan
;
1065 assert_cfg80211_lock();
1067 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1068 chan
= &sband
->channels
[chan_idx
];
1070 if (likely(chan
->center_freq
!= reg_beacon
->chan
.center_freq
))
1073 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
) {
1074 chan
->flags
&= ~IEEE80211_CHAN_PASSIVE_SCAN
;
1075 REG_DEBUG_BEACON_FLAG("active scanning");
1078 if (chan
->flags
& IEEE80211_CHAN_NO_IBSS
) {
1079 chan
->flags
&= ~IEEE80211_CHAN_NO_IBSS
;
1080 REG_DEBUG_BEACON_FLAG("beaconing");
1083 chan
->beacon_found
= true;
1084 #undef REG_DEBUG_BEACON_FLAG
1088 * Called when a scan on a wiphy finds a beacon on
1091 static void wiphy_update_new_beacon(struct wiphy
*wiphy
,
1092 struct reg_beacon
*reg_beacon
)
1095 struct ieee80211_supported_band
*sband
;
1097 assert_cfg80211_lock();
1099 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
1102 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1104 for (i
= 0; i
< sband
->n_channels
; i
++)
1105 handle_reg_beacon(wiphy
, i
, reg_beacon
);
1109 * Called upon reg changes or a new wiphy is added
1111 static void wiphy_update_beacon_reg(struct wiphy
*wiphy
)
1114 struct ieee80211_supported_band
*sband
;
1115 struct reg_beacon
*reg_beacon
;
1117 assert_cfg80211_lock();
1119 if (list_empty(®_beacon_list
))
1122 list_for_each_entry(reg_beacon
, ®_beacon_list
, list
) {
1123 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
1125 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1126 for (i
= 0; i
< sband
->n_channels
; i
++)
1127 handle_reg_beacon(wiphy
, i
, reg_beacon
);
1131 static bool reg_is_world_roaming(struct wiphy
*wiphy
)
1133 if (is_world_regdom(cfg80211_regdomain
->alpha2
) ||
1134 (wiphy
->regd
&& is_world_regdom(wiphy
->regd
->alpha2
)))
1136 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1137 wiphy
->custom_regulatory
)
1142 /* Reap the advantages of previously found beacons */
1143 static void reg_process_beacons(struct wiphy
*wiphy
)
1145 if (!reg_is_world_roaming(wiphy
))
1147 wiphy_update_beacon_reg(wiphy
);
1150 void wiphy_update_regulatory(struct wiphy
*wiphy
,
1151 enum nl80211_reg_initiator initiator
)
1153 enum ieee80211_band band
;
1155 if (ignore_reg_update(wiphy
, initiator
))
1157 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1158 if (wiphy
->bands
[band
])
1159 handle_band(wiphy
, band
);
1162 reg_process_beacons(wiphy
);
1163 if (wiphy
->reg_notifier
)
1164 wiphy
->reg_notifier(wiphy
, last_request
);
1167 static void handle_channel_custom(struct wiphy
*wiphy
,
1168 enum ieee80211_band band
,
1169 unsigned int chan_idx
,
1170 const struct ieee80211_regdomain
*regd
)
1173 u32 max_bandwidth
= 0;
1174 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1175 const struct ieee80211_power_rule
*power_rule
= NULL
;
1176 struct ieee80211_supported_band
*sband
;
1177 struct ieee80211_channel
*chan
;
1179 sband
= wiphy
->bands
[band
];
1180 BUG_ON(chan_idx
>= sband
->n_channels
);
1181 chan
= &sband
->channels
[chan_idx
];
1183 r
= freq_reg_info_regd(wiphy
, MHZ_TO_KHZ(chan
->center_freq
),
1184 &max_bandwidth
, ®_rule
, regd
);
1187 chan
->flags
= IEEE80211_CHAN_DISABLED
;
1191 power_rule
= ®_rule
->power_rule
;
1193 chan
->flags
|= map_regdom_flags(reg_rule
->flags
);
1194 chan
->max_antenna_gain
= (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
1195 chan
->max_bandwidth
= KHZ_TO_MHZ(max_bandwidth
);
1196 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
1199 static void handle_band_custom(struct wiphy
*wiphy
, enum ieee80211_band band
,
1200 const struct ieee80211_regdomain
*regd
)
1203 struct ieee80211_supported_band
*sband
;
1205 BUG_ON(!wiphy
->bands
[band
]);
1206 sband
= wiphy
->bands
[band
];
1208 for (i
= 0; i
< sband
->n_channels
; i
++)
1209 handle_channel_custom(wiphy
, band
, i
, regd
);
1212 /* Used by drivers prior to wiphy registration */
1213 void wiphy_apply_custom_regulatory(struct wiphy
*wiphy
,
1214 const struct ieee80211_regdomain
*regd
)
1216 enum ieee80211_band band
;
1217 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1218 if (wiphy
->bands
[band
])
1219 handle_band_custom(wiphy
, band
, regd
);
1222 EXPORT_SYMBOL(wiphy_apply_custom_regulatory
);
1224 static int reg_copy_regd(const struct ieee80211_regdomain
**dst_regd
,
1225 const struct ieee80211_regdomain
*src_regd
)
1227 struct ieee80211_regdomain
*regd
;
1228 int size_of_regd
= 0;
1231 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
1232 ((src_regd
->n_reg_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
1234 regd
= kzalloc(size_of_regd
, GFP_KERNEL
);
1238 memcpy(regd
, src_regd
, sizeof(struct ieee80211_regdomain
));
1240 for (i
= 0; i
< src_regd
->n_reg_rules
; i
++)
1241 memcpy(®d
->reg_rules
[i
], &src_regd
->reg_rules
[i
],
1242 sizeof(struct ieee80211_reg_rule
));
1249 * Return value which can be used by ignore_request() to indicate
1250 * it has been determined we should intersect two regulatory domains
1252 #define REG_INTERSECT 1
1254 /* This has the logic which determines when a new request
1255 * should be ignored. */
1256 static int ignore_request(struct wiphy
*wiphy
,
1257 struct regulatory_request
*pending_request
)
1259 struct wiphy
*last_wiphy
= NULL
;
1261 assert_cfg80211_lock();
1263 /* All initial requests are respected */
1267 switch (pending_request
->initiator
) {
1268 case NL80211_REGDOM_SET_BY_CORE
:
1270 case NL80211_REGDOM_SET_BY_COUNTRY_IE
:
1272 last_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1274 if (unlikely(!is_an_alpha2(pending_request
->alpha2
)))
1276 if (last_request
->initiator
==
1277 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1278 if (last_wiphy
!= wiphy
) {
1280 * Two cards with two APs claiming different
1281 * different Country IE alpha2s. We could
1282 * intersect them, but that seems unlikely
1283 * to be correct. Reject second one for now.
1285 if (regdom_changes(pending_request
->alpha2
))
1290 * Two consecutive Country IE hints on the same wiphy.
1291 * This should be picked up early by the driver/stack
1293 if (WARN_ON(regdom_changes(pending_request
->alpha2
)))
1297 return REG_INTERSECT
;
1298 case NL80211_REGDOM_SET_BY_DRIVER
:
1299 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_CORE
) {
1300 if (is_old_static_regdom(cfg80211_regdomain
))
1302 if (regdom_changes(pending_request
->alpha2
))
1308 * This would happen if you unplug and plug your card
1309 * back in or if you add a new device for which the previously
1310 * loaded card also agrees on the regulatory domain.
1312 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1313 !regdom_changes(pending_request
->alpha2
))
1316 return REG_INTERSECT
;
1317 case NL80211_REGDOM_SET_BY_USER
:
1318 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
)
1319 return REG_INTERSECT
;
1321 * If the user knows better the user should set the regdom
1322 * to their country before the IE is picked up
1324 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
&&
1325 last_request
->intersect
)
1328 * Process user requests only after previous user/driver/core
1329 * requests have been processed
1331 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_CORE
||
1332 last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
||
1333 last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
) {
1334 if (regdom_changes(last_request
->alpha2
))
1338 if (!is_old_static_regdom(cfg80211_regdomain
) &&
1339 !regdom_changes(pending_request
->alpha2
))
1349 * __regulatory_hint - hint to the wireless core a regulatory domain
1350 * @wiphy: if the hint comes from country information from an AP, this
1351 * is required to be set to the wiphy that received the information
1352 * @pending_request: the regulatory request currently being processed
1354 * The Wireless subsystem can use this function to hint to the wireless core
1355 * what it believes should be the current regulatory domain.
1357 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1358 * already been set or other standard error codes.
1360 * Caller must hold &cfg80211_mutex
1362 static int __regulatory_hint(struct wiphy
*wiphy
,
1363 struct regulatory_request
*pending_request
)
1365 bool intersect
= false;
1368 assert_cfg80211_lock();
1370 r
= ignore_request(wiphy
, pending_request
);
1372 if (r
== REG_INTERSECT
) {
1373 if (pending_request
->initiator
==
1374 NL80211_REGDOM_SET_BY_DRIVER
) {
1375 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1377 kfree(pending_request
);
1384 * If the regulatory domain being requested by the
1385 * driver has already been set just copy it to the
1388 if (r
== -EALREADY
&&
1389 pending_request
->initiator
==
1390 NL80211_REGDOM_SET_BY_DRIVER
) {
1391 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1393 kfree(pending_request
);
1399 kfree(pending_request
);
1404 kfree(last_request
);
1406 last_request
= pending_request
;
1407 last_request
->intersect
= intersect
;
1409 pending_request
= NULL
;
1411 /* When r == REG_INTERSECT we do need to call CRDA */
1414 * Since CRDA will not be called in this case as we already
1415 * have applied the requested regulatory domain before we just
1416 * inform userspace we have processed the request
1419 nl80211_send_reg_change_event(last_request
);
1423 return call_crda(last_request
->alpha2
);
1426 /* This currently only processes user and driver regulatory hints */
1427 static void reg_process_hint(struct regulatory_request
*reg_request
)
1430 struct wiphy
*wiphy
= NULL
;
1432 BUG_ON(!reg_request
->alpha2
);
1434 mutex_lock(&cfg80211_mutex
);
1436 if (wiphy_idx_valid(reg_request
->wiphy_idx
))
1437 wiphy
= wiphy_idx_to_wiphy(reg_request
->wiphy_idx
);
1439 if (reg_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1445 r
= __regulatory_hint(wiphy
, reg_request
);
1446 /* This is required so that the orig_* parameters are saved */
1447 if (r
== -EALREADY
&& wiphy
&& wiphy
->strict_regulatory
)
1448 wiphy_update_regulatory(wiphy
, reg_request
->initiator
);
1450 mutex_unlock(&cfg80211_mutex
);
1453 /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */
1454 static void reg_process_pending_hints(void)
1456 struct regulatory_request
*reg_request
;
1458 spin_lock(®_requests_lock
);
1459 while (!list_empty(®_requests_list
)) {
1460 reg_request
= list_first_entry(®_requests_list
,
1461 struct regulatory_request
,
1463 list_del_init(®_request
->list
);
1465 spin_unlock(®_requests_lock
);
1466 reg_process_hint(reg_request
);
1467 spin_lock(®_requests_lock
);
1469 spin_unlock(®_requests_lock
);
1472 /* Processes beacon hints -- this has nothing to do with country IEs */
1473 static void reg_process_pending_beacon_hints(void)
1475 struct cfg80211_registered_device
*drv
;
1476 struct reg_beacon
*pending_beacon
, *tmp
;
1478 mutex_lock(&cfg80211_mutex
);
1480 /* This goes through the _pending_ beacon list */
1481 spin_lock_bh(®_pending_beacons_lock
);
1483 if (list_empty(®_pending_beacons
)) {
1484 spin_unlock_bh(®_pending_beacons_lock
);
1488 list_for_each_entry_safe(pending_beacon
, tmp
,
1489 ®_pending_beacons
, list
) {
1491 list_del_init(&pending_beacon
->list
);
1493 /* Applies the beacon hint to current wiphys */
1494 list_for_each_entry(drv
, &cfg80211_drv_list
, list
)
1495 wiphy_update_new_beacon(&drv
->wiphy
, pending_beacon
);
1497 /* Remembers the beacon hint for new wiphys or reg changes */
1498 list_add_tail(&pending_beacon
->list
, ®_beacon_list
);
1501 spin_unlock_bh(®_pending_beacons_lock
);
1503 mutex_unlock(&cfg80211_mutex
);
1506 static void reg_todo(struct work_struct
*work
)
1508 reg_process_pending_hints();
1509 reg_process_pending_beacon_hints();
1512 static DECLARE_WORK(reg_work
, reg_todo
);
1514 static void queue_regulatory_request(struct regulatory_request
*request
)
1516 spin_lock(®_requests_lock
);
1517 list_add_tail(&request
->list
, ®_requests_list
);
1518 spin_unlock(®_requests_lock
);
1520 schedule_work(®_work
);
1523 /* Core regulatory hint -- happens once during cfg80211_init() */
1524 static int regulatory_hint_core(const char *alpha2
)
1526 struct regulatory_request
*request
;
1528 BUG_ON(last_request
);
1530 request
= kzalloc(sizeof(struct regulatory_request
),
1535 request
->alpha2
[0] = alpha2
[0];
1536 request
->alpha2
[1] = alpha2
[1];
1537 request
->initiator
= NL80211_REGDOM_SET_BY_CORE
;
1539 queue_regulatory_request(request
);
1545 int regulatory_hint_user(const char *alpha2
)
1547 struct regulatory_request
*request
;
1551 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1555 request
->wiphy_idx
= WIPHY_IDX_STALE
;
1556 request
->alpha2
[0] = alpha2
[0];
1557 request
->alpha2
[1] = alpha2
[1];
1558 request
->initiator
= NL80211_REGDOM_SET_BY_USER
,
1560 queue_regulatory_request(request
);
1566 int regulatory_hint(struct wiphy
*wiphy
, const char *alpha2
)
1568 struct regulatory_request
*request
;
1573 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1577 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
1579 /* Must have registered wiphy first */
1580 BUG_ON(!wiphy_idx_valid(request
->wiphy_idx
));
1582 request
->alpha2
[0] = alpha2
[0];
1583 request
->alpha2
[1] = alpha2
[1];
1584 request
->initiator
= NL80211_REGDOM_SET_BY_DRIVER
;
1586 queue_regulatory_request(request
);
1590 EXPORT_SYMBOL(regulatory_hint
);
1592 static bool reg_same_country_ie_hint(struct wiphy
*wiphy
,
1593 u32 country_ie_checksum
)
1595 struct wiphy
*request_wiphy
;
1597 assert_cfg80211_lock();
1599 if (unlikely(last_request
->initiator
!=
1600 NL80211_REGDOM_SET_BY_COUNTRY_IE
))
1603 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1608 if (likely(request_wiphy
!= wiphy
))
1609 return !country_ie_integrity_changes(country_ie_checksum
);
1611 * We should not have let these through at this point, they
1612 * should have been picked up earlier by the first alpha2 check
1615 if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum
)))
1620 void regulatory_hint_11d(struct wiphy
*wiphy
,
1624 struct ieee80211_regdomain
*rd
= NULL
;
1627 enum environment_cap env
= ENVIRON_ANY
;
1628 struct regulatory_request
*request
;
1630 mutex_lock(&cfg80211_mutex
);
1632 if (unlikely(!last_request
)) {
1633 mutex_unlock(&cfg80211_mutex
);
1637 /* IE len must be evenly divisible by 2 */
1638 if (country_ie_len
& 0x01)
1641 if (country_ie_len
< IEEE80211_COUNTRY_IE_MIN_LEN
)
1645 * Pending country IE processing, this can happen after we
1646 * call CRDA and wait for a response if a beacon was received before
1647 * we were able to process the last regulatory_hint_11d() call
1649 if (country_ie_regdomain
)
1652 alpha2
[0] = country_ie
[0];
1653 alpha2
[1] = country_ie
[1];
1655 if (country_ie
[2] == 'I')
1656 env
= ENVIRON_INDOOR
;
1657 else if (country_ie
[2] == 'O')
1658 env
= ENVIRON_OUTDOOR
;
1661 * We will run this for *every* beacon processed for the BSSID, so
1662 * we optimize an early check to exit out early if we don't have to
1665 if (likely(last_request
->initiator
==
1666 NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1667 wiphy_idx_valid(last_request
->wiphy_idx
))) {
1668 struct cfg80211_registered_device
*drv_last_ie
;
1671 cfg80211_drv_by_wiphy_idx(last_request
->wiphy_idx
);
1674 * Lets keep this simple -- we trust the first AP
1675 * after we intersect with CRDA
1677 if (likely(&drv_last_ie
->wiphy
== wiphy
)) {
1679 * Ignore IEs coming in on this wiphy with
1680 * the same alpha2 and environment cap
1682 if (likely(alpha2_equal(drv_last_ie
->country_ie_alpha2
,
1684 env
== drv_last_ie
->env
)) {
1688 * the wiphy moved on to another BSSID or the AP
1689 * was reconfigured. XXX: We need to deal with the
1690 * case where the user suspends and goes to goes
1691 * to another country, and then gets IEs from an
1692 * AP with different settings
1697 * Ignore IEs coming in on two separate wiphys with
1698 * the same alpha2 and environment cap
1700 if (likely(alpha2_equal(drv_last_ie
->country_ie_alpha2
,
1702 env
== drv_last_ie
->env
)) {
1705 /* We could potentially intersect though */
1710 rd
= country_ie_2_rd(country_ie
, country_ie_len
, &checksum
);
1715 * This will not happen right now but we leave it here for the
1716 * the future when we want to add suspend/resume support and having
1717 * the user move to another country after doing so, or having the user
1718 * move to another AP. Right now we just trust the first AP.
1720 * If we hit this before we add this support we want to be informed of
1721 * it as it would indicate a mistake in the current design
1723 if (WARN_ON(reg_same_country_ie_hint(wiphy
, checksum
)))
1726 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1731 * We keep this around for when CRDA comes back with a response so
1732 * we can intersect with that
1734 country_ie_regdomain
= rd
;
1736 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
1737 request
->alpha2
[0] = rd
->alpha2
[0];
1738 request
->alpha2
[1] = rd
->alpha2
[1];
1739 request
->initiator
= NL80211_REGDOM_SET_BY_COUNTRY_IE
;
1740 request
->country_ie_checksum
= checksum
;
1741 request
->country_ie_env
= env
;
1743 mutex_unlock(&cfg80211_mutex
);
1745 queue_regulatory_request(request
);
1752 mutex_unlock(&cfg80211_mutex
);
1754 EXPORT_SYMBOL(regulatory_hint_11d
);
1756 static bool freq_is_chan_12_13_14(u16 freq
)
1758 if (freq
== ieee80211_channel_to_frequency(12) ||
1759 freq
== ieee80211_channel_to_frequency(13) ||
1760 freq
== ieee80211_channel_to_frequency(14))
1765 int regulatory_hint_found_beacon(struct wiphy
*wiphy
,
1766 struct ieee80211_channel
*beacon_chan
,
1769 struct reg_beacon
*reg_beacon
;
1771 if (likely((beacon_chan
->beacon_found
||
1772 (beacon_chan
->flags
& IEEE80211_CHAN_RADAR
) ||
1773 (beacon_chan
->band
== IEEE80211_BAND_2GHZ
&&
1774 !freq_is_chan_12_13_14(beacon_chan
->center_freq
)))))
1777 reg_beacon
= kzalloc(sizeof(struct reg_beacon
), gfp
);
1781 #ifdef CONFIG_CFG80211_REG_DEBUG
1782 printk(KERN_DEBUG
"cfg80211: Found new beacon on "
1783 "frequency: %d MHz (Ch %d) on %s\n",
1784 beacon_chan
->center_freq
,
1785 ieee80211_frequency_to_channel(beacon_chan
->center_freq
),
1788 memcpy(®_beacon
->chan
, beacon_chan
,
1789 sizeof(struct ieee80211_channel
));
1793 * Since we can be called from BH or and non-BH context
1794 * we must use spin_lock_bh()
1796 spin_lock_bh(®_pending_beacons_lock
);
1797 list_add_tail(®_beacon
->list
, ®_pending_beacons
);
1798 spin_unlock_bh(®_pending_beacons_lock
);
1800 schedule_work(®_work
);
1805 static void print_rd_rules(const struct ieee80211_regdomain
*rd
)
1808 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1809 const struct ieee80211_freq_range
*freq_range
= NULL
;
1810 const struct ieee80211_power_rule
*power_rule
= NULL
;
1812 printk(KERN_INFO
"\t(start_freq - end_freq @ bandwidth), "
1813 "(max_antenna_gain, max_eirp)\n");
1815 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
1816 reg_rule
= &rd
->reg_rules
[i
];
1817 freq_range
= ®_rule
->freq_range
;
1818 power_rule
= ®_rule
->power_rule
;
1821 * There may not be documentation for max antenna gain
1822 * in certain regions
1824 if (power_rule
->max_antenna_gain
)
1825 printk(KERN_INFO
"\t(%d KHz - %d KHz @ %d KHz), "
1826 "(%d mBi, %d mBm)\n",
1827 freq_range
->start_freq_khz
,
1828 freq_range
->end_freq_khz
,
1829 freq_range
->max_bandwidth_khz
,
1830 power_rule
->max_antenna_gain
,
1831 power_rule
->max_eirp
);
1833 printk(KERN_INFO
"\t(%d KHz - %d KHz @ %d KHz), "
1835 freq_range
->start_freq_khz
,
1836 freq_range
->end_freq_khz
,
1837 freq_range
->max_bandwidth_khz
,
1838 power_rule
->max_eirp
);
1842 static void print_regdomain(const struct ieee80211_regdomain
*rd
)
1845 if (is_intersected_alpha2(rd
->alpha2
)) {
1847 if (last_request
->initiator
==
1848 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1849 struct cfg80211_registered_device
*drv
;
1850 drv
= cfg80211_drv_by_wiphy_idx(
1851 last_request
->wiphy_idx
);
1853 printk(KERN_INFO
"cfg80211: Current regulatory "
1854 "domain updated by AP to: %c%c\n",
1855 drv
->country_ie_alpha2
[0],
1856 drv
->country_ie_alpha2
[1]);
1858 printk(KERN_INFO
"cfg80211: Current regulatory "
1859 "domain intersected: \n");
1861 printk(KERN_INFO
"cfg80211: Current regulatory "
1862 "domain intersected: \n");
1863 } else if (is_world_regdom(rd
->alpha2
))
1864 printk(KERN_INFO
"cfg80211: World regulatory "
1865 "domain updated:\n");
1867 if (is_unknown_alpha2(rd
->alpha2
))
1868 printk(KERN_INFO
"cfg80211: Regulatory domain "
1869 "changed to driver built-in settings "
1870 "(unknown country)\n");
1872 printk(KERN_INFO
"cfg80211: Regulatory domain "
1873 "changed to country: %c%c\n",
1874 rd
->alpha2
[0], rd
->alpha2
[1]);
1879 static void print_regdomain_info(const struct ieee80211_regdomain
*rd
)
1881 printk(KERN_INFO
"cfg80211: Regulatory domain: %c%c\n",
1882 rd
->alpha2
[0], rd
->alpha2
[1]);
1886 #ifdef CONFIG_CFG80211_REG_DEBUG
1887 static void reg_country_ie_process_debug(
1888 const struct ieee80211_regdomain
*rd
,
1889 const struct ieee80211_regdomain
*country_ie_regdomain
,
1890 const struct ieee80211_regdomain
*intersected_rd
)
1892 printk(KERN_DEBUG
"cfg80211: Received country IE:\n");
1893 print_regdomain_info(country_ie_regdomain
);
1894 printk(KERN_DEBUG
"cfg80211: CRDA thinks this should applied:\n");
1895 print_regdomain_info(rd
);
1896 if (intersected_rd
) {
1897 printk(KERN_DEBUG
"cfg80211: We intersect both of these "
1899 print_regdomain_info(intersected_rd
);
1902 printk(KERN_DEBUG
"cfg80211: Intersection between both failed\n");
1905 static inline void reg_country_ie_process_debug(
1906 const struct ieee80211_regdomain
*rd
,
1907 const struct ieee80211_regdomain
*country_ie_regdomain
,
1908 const struct ieee80211_regdomain
*intersected_rd
)
1913 /* Takes ownership of rd only if it doesn't fail */
1914 static int __set_regdom(const struct ieee80211_regdomain
*rd
)
1916 const struct ieee80211_regdomain
*intersected_rd
= NULL
;
1917 struct cfg80211_registered_device
*drv
= NULL
;
1918 struct wiphy
*request_wiphy
;
1919 /* Some basic sanity checks first */
1921 if (is_world_regdom(rd
->alpha2
)) {
1922 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
1924 update_world_regdomain(rd
);
1928 if (!is_alpha2_set(rd
->alpha2
) && !is_an_alpha2(rd
->alpha2
) &&
1929 !is_unknown_alpha2(rd
->alpha2
))
1936 * Lets only bother proceeding on the same alpha2 if the current
1937 * rd is non static (it means CRDA was present and was used last)
1938 * and the pending request came in from a country IE
1940 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1942 * If someone else asked us to change the rd lets only bother
1943 * checking if the alpha2 changes if CRDA was already called
1945 if (!is_old_static_regdom(cfg80211_regdomain
) &&
1946 !regdom_changes(rd
->alpha2
))
1951 * Now lets set the regulatory domain, update all driver channels
1952 * and finally inform them of what we have done, in case they want
1953 * to review or adjust their own settings based on their own
1954 * internal EEPROM data
1957 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
1960 if (!is_valid_rd(rd
)) {
1961 printk(KERN_ERR
"cfg80211: Invalid "
1962 "regulatory domain detected:\n");
1963 print_regdomain_info(rd
);
1967 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1969 if (!last_request
->intersect
) {
1972 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_DRIVER
) {
1974 cfg80211_regdomain
= rd
;
1979 * For a driver hint, lets copy the regulatory domain the
1980 * driver wanted to the wiphy to deal with conflicts
1983 BUG_ON(request_wiphy
->regd
);
1985 r
= reg_copy_regd(&request_wiphy
->regd
, rd
);
1990 cfg80211_regdomain
= rd
;
1994 /* Intersection requires a bit more work */
1996 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1998 intersected_rd
= regdom_intersect(rd
, cfg80211_regdomain
);
1999 if (!intersected_rd
)
2003 * We can trash what CRDA provided now.
2004 * However if a driver requested this specific regulatory
2005 * domain we keep it for its private use
2007 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
)
2008 request_wiphy
->regd
= rd
;
2015 cfg80211_regdomain
= intersected_rd
;
2021 * Country IE requests are handled a bit differently, we intersect
2022 * the country IE rd with what CRDA believes that country should have
2025 BUG_ON(!country_ie_regdomain
);
2026 BUG_ON(rd
== country_ie_regdomain
);
2029 * Intersect what CRDA returned and our what we
2030 * had built from the Country IE received
2033 intersected_rd
= regdom_intersect(rd
, country_ie_regdomain
);
2035 reg_country_ie_process_debug(rd
,
2036 country_ie_regdomain
,
2039 kfree(country_ie_regdomain
);
2040 country_ie_regdomain
= NULL
;
2042 if (!intersected_rd
)
2045 drv
= wiphy_to_dev(request_wiphy
);
2047 drv
->country_ie_alpha2
[0] = rd
->alpha2
[0];
2048 drv
->country_ie_alpha2
[1] = rd
->alpha2
[1];
2049 drv
->env
= last_request
->country_ie_env
;
2051 BUG_ON(intersected_rd
== rd
);
2057 cfg80211_regdomain
= intersected_rd
;
2064 * Use this call to set the current regulatory domain. Conflicts with
2065 * multiple drivers can be ironed out later. Caller must've already
2066 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2068 int set_regdom(const struct ieee80211_regdomain
*rd
)
2072 assert_cfg80211_lock();
2074 /* Note that this doesn't update the wiphys, this is done below */
2075 r
= __set_regdom(rd
);
2081 /* This would make this whole thing pointless */
2082 if (!last_request
->intersect
)
2083 BUG_ON(rd
!= cfg80211_regdomain
);
2085 /* update all wiphys now with the new established regulatory domain */
2086 update_all_wiphy_regulatory(last_request
->initiator
);
2088 print_regdomain(cfg80211_regdomain
);
2090 nl80211_send_reg_change_event(last_request
);
2095 /* Caller must hold cfg80211_mutex */
2096 void reg_device_remove(struct wiphy
*wiphy
)
2098 struct wiphy
*request_wiphy
;
2100 assert_cfg80211_lock();
2102 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
2105 if (!last_request
|| !request_wiphy
)
2107 if (request_wiphy
!= wiphy
)
2109 last_request
->wiphy_idx
= WIPHY_IDX_STALE
;
2110 last_request
->country_ie_env
= ENVIRON_ANY
;
2113 int regulatory_init(void)
2117 reg_pdev
= platform_device_register_simple("regulatory", 0, NULL
, 0);
2118 if (IS_ERR(reg_pdev
))
2119 return PTR_ERR(reg_pdev
);
2121 spin_lock_init(®_requests_lock
);
2122 spin_lock_init(®_pending_beacons_lock
);
2124 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
2125 cfg80211_regdomain
= static_regdom(ieee80211_regdom
);
2127 printk(KERN_INFO
"cfg80211: Using static regulatory domain info\n");
2128 print_regdomain_info(cfg80211_regdomain
);
2130 * The old code still requests for a new regdomain and if
2131 * you have CRDA you get it updated, otherwise you get
2132 * stuck with the static values. Since "EU" is not a valid
2133 * ISO / IEC 3166 alpha2 code we can't expect userpace to
2134 * give us a regulatory domain for it. We need last_request
2135 * iniitalized though so lets just send a request which we
2136 * know will be ignored... this crap will be removed once
2139 err
= regulatory_hint_core(ieee80211_regdom
);
2141 cfg80211_regdomain
= cfg80211_world_regdom
;
2143 err
= regulatory_hint_core(ieee80211_regdom
);
2149 * N.B. kobject_uevent_env() can fail mainly for when we're out
2150 * memory which is handled and propagated appropriately above
2151 * but it can also fail during a netlink_broadcast() or during
2152 * early boot for call_usermodehelper(). For now treat these
2153 * errors as non-fatal.
2155 printk(KERN_ERR
"cfg80211: kobject_uevent_env() was unable "
2156 "to call CRDA during init");
2157 #ifdef CONFIG_CFG80211_REG_DEBUG
2158 /* We want to find out exactly why when debugging */
2166 void regulatory_exit(void)
2168 struct regulatory_request
*reg_request
, *tmp
;
2169 struct reg_beacon
*reg_beacon
, *btmp
;
2171 cancel_work_sync(®_work
);
2173 mutex_lock(&cfg80211_mutex
);
2177 kfree(country_ie_regdomain
);
2178 country_ie_regdomain
= NULL
;
2180 kfree(last_request
);
2182 platform_device_unregister(reg_pdev
);
2184 spin_lock_bh(®_pending_beacons_lock
);
2185 if (!list_empty(®_pending_beacons
)) {
2186 list_for_each_entry_safe(reg_beacon
, btmp
,
2187 ®_pending_beacons
, list
) {
2188 list_del(®_beacon
->list
);
2192 spin_unlock_bh(®_pending_beacons_lock
);
2194 if (!list_empty(®_beacon_list
)) {
2195 list_for_each_entry_safe(reg_beacon
, btmp
,
2196 ®_beacon_list
, list
) {
2197 list_del(®_beacon
->list
);
2202 spin_lock(®_requests_lock
);
2203 if (!list_empty(®_requests_list
)) {
2204 list_for_each_entry_safe(reg_request
, tmp
,
2205 ®_requests_list
, list
) {
2206 list_del(®_request
->list
);
2210 spin_unlock(®_requests_lock
);
2212 mutex_unlock(&cfg80211_mutex
);